Thank you very much for your help. Actually, it was my fault (again). I changed this :
while (av_read_frame(formatContext, &packet) >= 0 && !extraxted) by this: while (!extraxted && av_read_frame(formatContext, &packet) >= 0) Because of that mistake, sometimes, a frame was read but never processed. And now, it works like a charm! Thanks!
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